Support interface fan speed

src/libslic3r/GCode.cpp

@@ -4114,6 +4114,8 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
     auto overhang_fan_threshold = EXTRUDER_CONFIG(overhang_fan_threshold);
     auto enable_overhang_bridge_fan = EXTRUDER_CONFIG(enable_overhang_bridge_fan);
     
+    auto supp_interface_fan_speed = EXTRUDER_CONFIG(support_material_interface_fan_speed);
+
 
     //    { "0%", Overhang_threshold_none },
     //    { "5%", Overhang_threshold_1_4 },
@@ -4151,12 +4153,14 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
             comment += ";_EXTERNAL_PERIMETER";
     }
     bool is_overhang_fan_on = false;
+    bool is_supp_interface_fan_on = false;
     if (!variable_speed) {
         // F is mm per minute.
         gcode += m_writer.set_speed(F, "", comment);
         double path_length = 0.;
         {
-            if (m_enable_cooling_markers && enable_overhang_bridge_fan) {
+            if (m_enable_cooling_markers) {
+                if (enable_overhang_bridge_fan) {
                     // BBS: Overhang_threshold_none means Overhang_threshold_1_4 and forcing cooling for all external
                     // perimeter
                     int overhang_threshold = overhang_fan_threshold == Overhang_threshold_none ? Overhang_threshold_none
@@ -4167,6 +4171,11 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                         is_overhang_fan_on = true;
                     }
                 }
+                if(supp_interface_fan_speed >= 0 && path.role() == erSupportMaterialInterface) {
+                    gcode += ";_SUPP_INTERFACE_FAN_START\n";
+                    is_supp_interface_fan_on = true;
+                }
+            } 
             // BBS: use G1 if not enable arc fitting or has no arc fitting result or in spiral_mode mode
             // Attention: G2 and G3 is not supported in spiral_mode mode
             if (!m_config.enable_arc_fitting || path.polyline.fitting_result.empty() || m_config.spiral_mode) {
@@ -4222,6 +4231,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                 is_overhang_fan_on = false;
                 gcode += ";_OVERHANG_FAN_END\n";
             }
+            if (is_supp_interface_fan_on) {
+                is_supp_interface_fan_on = false;
+                gcode += ";_SUPP_INTERFACE_FAN_END\n";
+            }
         }
     } else {
         double last_set_speed = std::max((float)EXTRUDER_CONFIG(slow_down_min_speed), new_points[0].speed) * 60.0;
@@ -4232,7 +4245,8 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
             const ProcessedPoint &processed_point = new_points[i];
             Vec2d p = this->point_to_gcode_quantized(processed_point.p);
             const double line_length = (p - prev).norm();
-            if (m_enable_cooling_markers && enable_overhang_bridge_fan) {
+            if (m_enable_cooling_markers) {
+                if(enable_overhang_bridge_fan) {
                     if (is_bridge(path.role()) || check_overhang_fan(new_points[i - 1].overlap) ) {
                         if(!is_overhang_fan_on)
                             gcode += ";_OVERHANG_FAN_START\n";
@@ -4242,6 +4256,19 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                             gcode += ";_OVERHANG_FAN_END\n";
                             is_overhang_fan_on = false;
                         }
+                    }
+                }
+                if(supp_interface_fan_speed >= 0){
+                    if(path.role() == erSupportMaterialInterface) {
+                        if(!is_supp_interface_fan_on)
+                            gcode += ";_SUPP_INTERFACE_FAN_START\n";
+                        is_supp_interface_fan_on = true;
+                    } else {
+                        if(is_supp_interface_fan_on) {
+                            gcode += ";_SUPP_INTERFACE_FAN_END\n";
+                            is_supp_interface_fan_on = false;
+                        }
+                    }
                     
                 }
             }
@@ -4259,6 +4286,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
             is_overhang_fan_on = false;
             gcode += ";_OVERHANG_FAN_END\n";
         }
+        if(is_supp_interface_fan_on) {
+            gcode += ";_SUPP_INTERFACE_FAN_END\n";
+            is_supp_interface_fan_on = false;
+        }
     }
     if (m_enable_cooling_markers) {
         gcode += ";_EXTRUDE_END\n";

src/libslic3r/GCode/CoolingBuffer.cpp

@@ -61,6 +61,8 @@ struct CoolingLine
         TYPE_G2                 = 1 << 12,
         TYPE_G3                 = 1 << 13,
         TYPE_FORCE_RESUME_FAN   = 1 << 14,
+        TYPE_SUPPORT_INTERFACE_FAN_START     = 1 << 15,
+        TYPE_SUPPORT_INTERFACE_FAN_END       = 1 << 16,
     };
 
     CoolingLine(unsigned int type, size_t  line_start, size_t  line_end) :
@@ -479,6 +481,10 @@ std::vector<PerExtruderAdjustments> CoolingBuffer::parse_layer_gcode(const std::
             line.type = CoolingLine::TYPE_OVERHANG_FAN_START;
         } else if (boost::starts_with(sline, ";_OVERHANG_FAN_END")) {
             line.type = CoolingLine::TYPE_OVERHANG_FAN_END;
+        } else if (boost::starts_with(sline, ";_SUPP_INTERFACE_FAN_START")) {
+            line.type = CoolingLine::TYPE_SUPPORT_INTERFACE_FAN_START;
+        } else if (boost::starts_with(sline, ";_SUPP_INTERFACE_FAN_END")) {
+            line.type = CoolingLine::TYPE_SUPPORT_INTERFACE_FAN_END;
         } else if (boost::starts_with(sline, "G4 ")) {
             // Parse the wait time.
             line.type = CoolingLine::TYPE_G4;
@@ -722,7 +728,9 @@ std::string CoolingBuffer::apply_layer_cooldown(
     new_gcode.reserve(gcode.size() * 2);
     bool overhang_fan_control= false;
     int  overhang_fan_speed   = 0;
-    auto change_extruder_set_fan = [ this, layer_id, layer_time, &new_gcode, &overhang_fan_control, &overhang_fan_speed](bool immediately_apply) {
+    bool supp_interface_fan_control= false;
+    int  supp_interface_fan_speed = 0;
+    auto change_extruder_set_fan = [ this, layer_id, layer_time, &new_gcode, &overhang_fan_control, &overhang_fan_speed, &supp_interface_fan_control, &supp_interface_fan_speed](bool immediately_apply) {
 #define EXTRUDER_CONFIG(OPT) m_config.OPT.get_at(m_current_extruder)
         int fan_min_speed = EXTRUDER_CONFIG(fan_min_speed);
         int fan_speed_new = EXTRUDER_CONFIG(reduce_fan_stop_start_freq) ? fan_min_speed : 0;
@@ -731,6 +739,8 @@ std::string CoolingBuffer::apply_layer_cooldown(
         int close_fan_the_first_x_layers = EXTRUDER_CONFIG(close_fan_the_first_x_layers);
         // Is the fan speed ramp enabled?
         int full_fan_speed_layer = EXTRUDER_CONFIG(full_fan_speed_layer);
+        supp_interface_fan_speed = EXTRUDER_CONFIG(support_material_interface_fan_speed);
+
         if (close_fan_the_first_x_layers <= 0 && full_fan_speed_layer > 0) {
             // When ramping up fan speed from close_fan_the_first_x_layers to full_fan_speed_layer, force close_fan_the_first_x_layers above zero,
             // so there will be a zero fan speed at least at the 1st layer.
@@ -759,6 +769,9 @@ std::string CoolingBuffer::apply_layer_cooldown(
                 fan_speed_new    = std::clamp(int(float(fan_speed_new) * factor + 0.5f), 0, 255);
                 overhang_fan_speed = std::clamp(int(float(overhang_fan_speed) * factor + 0.5f), 0, 255);
             }
+            supp_interface_fan_speed = EXTRUDER_CONFIG(support_material_interface_fan_speed);
+            supp_interface_fan_control = supp_interface_fan_speed >= 0;
+
 #undef EXTRUDER_CONFIG
             overhang_fan_control= overhang_fan_speed > fan_speed_new;
         } else {
@@ -766,6 +779,8 @@ std::string CoolingBuffer::apply_layer_cooldown(
             overhang_fan_speed   = 0;
             fan_speed_new      = 0;
             additional_fan_speed_new = 0;
+            supp_interface_fan_control= false;
+            supp_interface_fan_speed   = 0;
         }
         if (fan_speed_new != m_fan_speed) {
             m_fan_speed = fan_speed_new;
@@ -809,6 +824,16 @@ std::string CoolingBuffer::apply_layer_cooldown(
                 m_current_fan_speed = m_fan_speed;
                 new_gcode += GCodeWriter::set_fan(m_config.gcode_flavor, m_fan_speed);
             }
+        } else if (line->type & CoolingLine::TYPE_SUPPORT_INTERFACE_FAN_START) {
+            if (supp_interface_fan_control) {
+                m_current_fan_speed = supp_interface_fan_speed;
+                new_gcode += GCodeWriter::set_fan(m_config.gcode_flavor, supp_interface_fan_speed);
+            }
+        } else if (line->type & CoolingLine::TYPE_SUPPORT_INTERFACE_FAN_END) {
+            if (supp_interface_fan_control) {
+                m_current_fan_speed = m_fan_speed;
+                new_gcode += GCodeWriter::set_fan(m_config.gcode_flavor, m_fan_speed);
+            }
         } else if (line->type & CoolingLine::TYPE_FORCE_RESUME_FAN) {
             //BBS: force to write a fan speed command again
             if (m_current_fan_speed != -1)

src/libslic3r/Preset.cpp

@@ -781,7 +781,7 @@ static std::vector<std::string> s_Preset_filament_options {
     "filament_wipe_distance", "additional_cooling_fan_speed",
     "bed_temperature_difference", "nozzle_temperature_range_low", "nozzle_temperature_range_high",
     //SoftFever
-    "enable_pressure_advance", "pressure_advance","chamber_temperature", "filament_shrink"/*,"filament_seam_gap"*/
+    "enable_pressure_advance", "pressure_advance","chamber_temperature", "filament_shrink", "support_material_interface_fan_speed" /*,"filament_seam_gap"*/
 };
 
 static std::vector<std::string> s_Preset_machine_limits_options {

src/libslic3r/Print.cpp

@@ -166,7 +166,8 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
         "wipe_on_loops",
         "gcode_comments",
         "gcode_label_objects", 
-        "exclude_object"
+        "exclude_object",
+        "support_material_interface_fan_speed"
     };
 
     static std::unordered_set<std::string> steps_ignore;

src/libslic3r/PrintConfig.cpp

@@ -1660,6 +1660,18 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionInts { 0 });
     
+    def = this->add("support_material_interface_fan_speed", coInts);
+    def->label = L("Support interface fan speed");
+    def->tooltip = L("This fan speed is enforced during all support interfaces, to be able to weaken their bonding with a high fan speed."
+        "\nSet to -1 to disable this override."
+        "\nCan only be overriden by disable_fan_first_layers.");
+    def->sidetext = L("%");
+    def->min = -1;
+    def->max = 100;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionInts{ -1 });
+    
+
     def = this->add("fuzzy_skin", coEnum);
     def->label = L("Fuzzy Skin");
     def->category = L("Others");

src/libslic3r/PrintConfig.hpp

@@ -1011,6 +1011,7 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionBool,                exclude_object))
     ((ConfigOptionBool,                gcode_comments))
     ((ConfigOptionInt,                 slow_down_layers))
+    ((ConfigOptionInts,                support_material_interface_fan_speed))
 
 
 )

src/slic3r/GUI/Tab.cpp

@@ -2759,6 +2759,7 @@ void TabFilament::build()
         optgroup->append_single_option_line("enable_overhang_bridge_fan", "auto-cooling");
         optgroup->append_single_option_line("overhang_fan_threshold", "auto-cooling");
         optgroup->append_single_option_line("overhang_fan_speed", "auto-cooling");
+        optgroup->append_single_option_line("support_material_interface_fan_speed");
 
         optgroup = page->new_optgroup(L("Auxiliary part cooling fan"), L"param_cooling_fan");
         optgroup->append_single_option_line("additional_cooling_fan_speed");